#define  _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<math.h>
int main()
{
	int n = 0;
	int sum = 0;
	scanf("%d", &n);
	for (int t = 1; t <= n; t++)
	{
		sum = sum + pow(2, t);
	}
	printf("result = %d", sum);
	return 0;
}